@article{ref1,
title="Shift-work schedules wreak havoc with employees' circadian rhythms",
journal="Occupational health and safety",
year="1989",
author="Polakoff, P. L.",
volume="",
number="",
pages="58-58",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0362-4064",
doi="",
url="http://dx.doi.org/"
}